roll down vs come down

roll down and come down both are verbs.

Word	Noun	Adjective	Verb	Adverb
roll down	No	No	Yes	No
come down	No	No	Yes	No

As verbs, come down is a hypernym of roll down; that is, come down is a word with a broader meaning than roll down:

Other hypernyms of roll down include descend, fall, go down.

roll down (verb)	come down (verb)
gather into a huge mass and roll down a mountain, of snow	get sick
	be the essential element
	criticize or reprimand harshly
	move downward and lower, but not necessarily all the way
	fall from clouds